uuid

How to convert the UUID to date format 2011-04-22 ? For example, I have UUID like this 118ffe80-466b-11e1-b5a5-5732cf729524. How to convert this to date format? I tried String uuid="118ffe80-466b-11e1-b5a5-5732cf729524"; UUID uid = UUID.fromString(uuid); long ls=convertTime(uid.timeStamp()); // it returns long value public String convertTime(long time){ System.out.println("====="+time); Date date = new Date(time); Format format = new SimpleDateFormat("yyyy/MM/dd"); return format.format(date).toString(); } output I got:4294744/11/02 Same case working fine for perl $uuid='ef802820-46b3-11e2-bf3a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to generate time based UUID in java - java.util.UUID.randomUUID() genrates a UUID version 4. How to generate a version 1 (time based) UUID ? Is there a separate library for that or is it some how provided in the Java 7 API and I am missing it. 回答1: Be very careful using com.eaio.uuid.UUID, if you need to generate GUID by time other than current time, as this will always generate the same UUID for given time. So if your data has requirement to generate UUID, where records may have same time, this will generate same UUID. We needed this

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I have code that looks like this: u := make ([] byte , 16 ) _ , err := rand . Read ( u ) if err != nil { return } u [ 8 ] = ( u [ 8 ] | 0x80 ) & 0xBF // what does this do? u [ 6 ] = ( u [ 6 ] | 0x40 ) & 0x4F // what does this do? return hex . EncodeToString ( u ) It returns a string with a length of 32, but I don't think it is a valid UUID. If it is a real UUID, why is it a UUID, and what is the purpose of the code that modifies the value of u[8] and u[6] . Is there a better way of generating UUIDs? 回答1: u [ 8 ] = ( u [ 8 ] | 0x80

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I currently have some ids stored in Mongo as UUIDs (necessary for processing). They get returned like this: "_id" : new BinData(3, "JliB6gIMRuSphAD2KmhzgQ==") What would be an easy way to turn this value into a string for debugging? Just to be clear - the application can handle the data fine. I just need a way to get the actual UUID from Mongo quickly. 回答1: The answer to your question is more complicated that you would expect! The main reason it's complicated is that for historical reasons (unfortunately) different drivers have written UUIDs

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am switching to Ramsey\Uuid and don't know what is the intended way to generate the Uuids. Either as shown in the examples with an anntoation: /** * @var UuidInterface * * @ORM\Id * @ORM\Column(type="uuid", unique=true) * @ORM\GeneratedValue(strategy="CUSTOM") * @ORM\CustomIdGenerator(class="Ramsey\Uuid\Doctrine\UuidGenerator") */ private $id ; public function __construct () { } Or manually in the constructor: /** * @var UuidInterface * * @ORM\Id * @ORM\Column(type="uuid", unique=true) */ private $id ; public function __construct

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've got a few iBeacon devices from Gimbal which are configurable through a website. I can assign new uuid, major, minor to any iBeacon devices I have. I'm puzzled at how the iBeacon devices know these configuration changed so that they can broadcast? The iBeacon devices can communicate to web server (this seems not make sense at all)? P.S.: I didn't call any Gimbal API because I set them to iBeacon type. Can anybody explain this? Thanks 回答1: Changing the identifiers of most iBeacons requires using an app that can talk to the beacon over

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am building an Android application that has specific requirements regarding Bluetooth Low Energy. I need to write to a Write-only characteristic and receive responses on a separate notification characteristic, and I need to do it in many, many activities. Is there a Rx way to send a request on the 1st characteristic, wait for the answer on the second one, then proceed to another request? Also, to share my instance of RxAndroidBle I thought about doing some sort of BleManager Singleton where I would expose the Observables, so I can easily

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: A UUID is, according to the specification, 128 bits or 16 bytes. The hexadecimal representation is 36 characters including the hyphens. I'm building a new table on DynamoDB and I have to decide the Type for the Hash key which I plan on filling with UUIDs. Should I create the table with a Hash key that is a String or Binary for these UUIDs? My gut tells me byte, because its less than half the size so that saves bandwidth, space, etc. Does anybody have experience one way or the other and have a good reason to go with one over the other? 回答1: I

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying to create tables that will have a primary key which is a UUID defined as binary(16) instead of the default auto-incrementing id field. I've managed to create migrations using raw SQL statements though DB::statement like so: DB::statement("CREATE TABLE `binary_primary_keys` ( `uuid` binary(16) NOT NULL DEFAULT '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0', `created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', `updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', PRIMARY KEY (`uuid`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Given that TimeUUID handily allows you to use now() in CQL, are there any reasons you wouldn't just go ahead and always use TimeUUID instead of plain old UUID? 回答1: UUID and TIMEUUID are stored the same way in Cassandra, and they only really represent two different sorting implementations. TIMEUUID columns are sorted by their time components first, and then by their raw bytes, whereas UUID columns are sorted by their version first, then if both are version 1 by their time component, and finally by their raw bytes. Curiosly the time component